insistent
adj.demanding something firmly and refusing to take 'no' for an answer. You use this to describe someone who keeps asking for something or a sound that will not stop.
adj.demanding something firmly or persistently; refusing to allow any alternative. Often describes a person's manner or a repetitive, unavoidable sound.
“She was insistent that we leave the party immediately.”
“Despite my repeated excuses, the salesman was insistent that I try the new software for a week.”
“The insistent ringing of the telephone eventually broke through his deep sleep, forcing him to answer the call despite the late hour.”
Often followed by the preposition 'on' or a 'that' clause.
Insistent is followed by the preposition 'on' and a gerund, not a 'to' infinitive.
From Latin insistens, participle of insisto.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.